Social application indicates the application that you can enjoy with your friends, friends of your friends and other users who you met through applications on SNS. There are several types in Social Applications such as battle type, information sharing type and communication-focused type and what charactrizes them is their eternal viral effects, from friends to the other friends or from people to people.
Until recently, SNS only developped funtions by themselves such as photo-album and movie-sharing, however, once it opened the environment that enables third party developpers to handle information within SNS, number of social applications started to be released one after another on SNS. Especially the global SNS 「facebook」 with over 1,50 million monthly unique users has already had approximately 60,000 applications that many users enjoy.